I have three math questions that I can't figure out. Simplifying... PLEASE HELP!?

__-5x__ Determine the largest value that makes the expression undefined:
x^3 - 5x^

__x^2 - 25__ Reduce the the expression to it's lowest terms.
7(x+5)

Simplify:
__a - 2y__
a + 3y
divided by
__3a - 6y__
a + 2y
 
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